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POChange color without affecting anything previously drawn
 

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  1. POChange color without affecting anything previously drawn
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    <p>I have the following <code>CustomView</code> I am using for painting in my app:</p> <pre><code>package com.test.testing; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Paint.Style; import android.view.MotionEvent; import android.widget.TextView; public class CustomView extends TextView { Paint paint; Path path; float x = 0; float y = 0; private int cWhite = Color.WHITE; public CustomView(Context context) { super(context); paint = new Paint(); path= new Path(); paint.setAlpha(255); paint.setColor(cWhite); paint.setStyle(Style.STROKE); paint.setStrokeWidth(20); } protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawPath(path,paint); canvas.drawCircle(x, y, 10, paint); } public boolean onTouchEvent(MotionEvent event) { int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: path.moveTo(event.getX(), event.getY()); path.lineTo(event.getX(), event.getY()); break; case MotionEvent.ACTION_MOVE: x = event.getX(); y = event.getY(); path.lineTo(x, y); invalidate(); break; case MotionEvent.ACTION_UP: path.lineTo(event.getX(), event.getY()); break; case MotionEvent.ACTION_CANCEL: break; default: break; } return true; } } </code></pre> <p>I setup a <code>FrameLayout</code> which keeps the canvas for drawing in my XML:</p> <pre><code>&lt;FrameLayout android:id="@+id/viewd" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="3" android:orientation="vertical" &gt; &lt;/FrameLayout&gt; </code></pre> <p>I call inside my <code>Activity</code> to get the view to enable the user to draw on:</p> <pre><code>layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(Activity.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); </code></pre> <p>I have different color option that user can choose from to change the paint stroke color in a <code>Dialog</code> within my <code>Activity</code>:</p> <pre><code>public void colorHandle() { // custom dialog final Dialog dialog = new Dialog(this); dialog.setContentView(R.layout.colorlayout); dialog.setTitle("Choose a Drawing Color"); Button btnWH = (Button) dialog.findViewById(R.id.btnWhite); Button btnBL = (Button) dialog.findViewById(R.id.btnBlack); Button btnBLU = (Button) dialog.findViewById(R.id.btnBlue); Button btnCY = (Button) dialog.findViewById(R.id.btnCyan); Button btnDG = (Button) dialog.findViewById(R.id.btnDkGray); Button btnGR = (Button) dialog.findViewById(R.id.btnGray); Button btnGRE = (Button) dialog.findViewById(R.id.btnGreen); Button btnLG = (Button) dialog.findViewById(R.id.btnLtGray); Button btnMG = (Button) dialog.findViewById(R.id.btnMagenta); Button btnRD = (Button) dialog.findViewById(R.id.btnRed); Button btnYE = (Button) dialog.findViewById(R.id.btnYellow); if (btnWH != null) { btnWH.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.WHITE); dialog.dismiss(); } }); } if (btnBL != null) { btnBL.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.BLACK); dialog.dismiss(); } }); } if (btnBLU != null) { btnBLU.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.BLUE); dialog.dismiss(); } }); } if (btnCY != null) { btnCY.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.CYAN); dialog.dismiss(); } }); } if (btnDG != null) { btnDG.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.DKGRAY); dialog.dismiss(); } }); } if (btnGR != null) { btnGR.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.GRAY); dialog.dismiss(); } }); } if (btnGRE != null) { btnGRE.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.GREEN); dialog.dismiss(); } }); } if (btnLG != null) { btnLG.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.LTGRAY); dialog.dismiss(); } }); } if (btnMG != null) { btnMG.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.MAGENTA); dialog.dismiss(); } }); } if (btnRD != null) { btnRD.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.RED); dialog.dismiss(); } }); } if (btnYE != null) { btnYE.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { view.paint.setColor(Color.YELLOW); dialog.dismiss(); } }); } dialog.show(); } </code></pre> <p>Everything is working fine except everytime I choose a new color, anything that was drawn previously also changes to the newly chosen color. How do I keep whatever was drawn previously unchanged no matter what new color is chosen next?</p>
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    1. COIn the onDraw function can you try setting canvas = new Canvas();
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      1. POChange color without affecting anything previously drawn
      1. USjaesanx
    2. CODidn't work. It doesnt even start the Draw method.
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    3. COYou are changing the colour, but then redrawing everything. What you need to do is store what has been drawn already, seperately. Then copy it back each time, with additions drawn on top.
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      1. POChange color without affecting anything previously drawn
      1. USDoomsknight
 

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